Geochemical Behaviour of Uranium in Sedimentary Formations: Insights From a Natural Analogue Study
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46356088%3A_____%2F09%3A%230001158" target="_blank" >RIV/46356088:_____/09:#0001158 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1115/ICEM2009-16340" target="_blank" >http://dx.doi.org/10.1115/ICEM2009-16340</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1115/ICEM2009-16340" target="_blank" >10.1115/ICEM2009-16340</a>
Alternative languages
Result language
angličtina
Original language name
Geochemical Behaviour of Uranium in Sedimentary Formations: Insights From a Natural Analogue Study
Original language description
Groundwater data from the natural analogue site Ruprechtov have been evaluated with special emphasis on the uranium behaviour in the so-called uranium-rich clay/lignite horizon. In this horizon in-situ Eh-values in the range of -160 to -280 mV seem to bedetermined by the SO(4)(2-)/HS(-) couple. Under these conditions U(IV) is expected to be the preferential redox state in solution. However, on-site measurements in groundwater from the clay/lignite horizon show only a fraction of about 20 % occurring inthe reduced state U(IV). Thermodynamic calculations reveal that the high CO(2) partial pressure in the clay/lignite horizon can stabilise hexavalent uranium, which explains the occurrence of U(VI). The calculations also indicate that the low uranium concentrations in the range between 0.2 and 2.1 mu g/l are controlled by amorphous UO(2) and/or the U(IV) phosphate mineral ningyoite. This confirms the findings from previous work that the uranium (IV) mineral phases are long-term stable un
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
DL - Nuclear waste, radioactive pollution and control
OECD FORD branch
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Result continuities
Project
<a href="/en/project/1H-PK%2F25" target="_blank" >1H-PK/25: Research of bariers for repositories of radioactive wastes.</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2009
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, Volume 2
ISBN
978-0-7918-4408-3
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
839-844
Publisher name
ASME
Place of publication
New York
Event location
Liverpool, UK
Event date
Jan 1, 2009
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000291330400103